Negroes are always telling us they are proud to be black, so they're obviously after some form of compensation, either that or they are severely upset they didn't receive slugs and lettuce for their main course.

The restaurant have nothing to apologise for. They weren't referred to in a derogatory way over their skin colour. Maybe next time, the staff will be more thoughtful and avoid making reference to this particular colour, and refer to them as 'the couple who are unlikely to want to pay...'